I have the same thing in a 2006 530xi wagon. My BMW mechanic said it is relatively common. I have one year left on my certified pre-owned warranty. Called BMW and they said I need to take it to an authorized dealer who can determine if it's covered, which I am going to do. Hoping it is, does anyone have any insight? Also, above suggests the pricetag for fixing this could be $400. Sounds like it's all labor, how much could the replacement bolt cost? Would be tempted to try myself but I'm not a mechanic.